It marked the first time a royal portrait has been taken by a non professional, and the first time Prince William has been involved in producing a major piece of art for public display. And the historic event was also captured on film.
Check out remarkable behind-the-scenes footage of the second-in-line's joint photoshoot with amateur photographer Jeff Hubbard, conducted under the guidance of renowned snapper Rankin.
See for yourself William's ease behind the camera, and the work which went into creating the images, which have drawn attention from all over the world.
Read the full story, and see the exclusive pictures in this week's HELLO! magazine.